My right front tire pressure raised from 90 to 98 and temp was 20 degrees warmer than all others. On a short 45m mile trip yesterday. Any ideas? Brake drag? Wheel bearing?

Then: "The information system relayed that the temperature was 20 degrees hotter than the other monitors on both sides of the coach while traveling about 60 mpg on a cool 80 degree day. The tire also increased in pressure by 10lbs, the other tires on both sides of the coach did not. The delta here is what I'm concerned with.

Upon further investigation, there is a significant amount of brake dust on the outside of the tire. Its opposite has none. I am betting its a caliper not releasing fully... "

Who was that that always gave a teaser at the start and then told the "rest of the story"? Good day!

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It is VERY common to have a delta in pressure & temperature between tires (by the way...they are related) from the sun side of the coach to the other side, aluminum wheel to steel wheel, etc. What you are looking for is something SIGNIFICANT between them. As stated earlier, 8 psi and 20F degrees is not considered excessive.

With ANY tire/wheel, if the pressure increases due to an abnormal cause, the temperature automatically follows. That's why a system that reports accurate pressures is way more important that monitoring temperatures and temp alarms.

The system I depend on does have a HIGH temp alarm, but it's for the sensor and is permanently set at 248F to warn the driver about a possible sensor failure. It also has a 25% HIGH pressure alarm.

Quote:

Originally Posted by Lincolnboy2

Upon further investigation, there is a significant amount of brake dust on the outside of the tire. Its opposite has none. I am betting its a caliper not releasing fully...

I am betting that if it was me walking around the coach measuring the tire & wheel temps with my IR gun, I would have noticed the BRAKE DUST immediately on the outside of the wheel & tire. That would have been my FIRST clue, not an after thought.

Lincolnboy, were you traveling in a direction where your right front tire was in the sun? My front tire when exposed to the sun is always a little warmer than the other side. Is your weight a little heavier on that side? Were you parked in a way with your RF in the sun before you left? It doesn't take much solar to heat a black tire.

It is VERY common to have a delta in pressure & temperature between tires (by the way...they are related) from the sun side of the coach to the other side, aluminum wheel to steel wheel, etc. What you are looking for is something SIGNIFICANT between them. As stated earlier, 8 psi and 20F degrees is not considered excessive.

With ANY tire/wheel, if the pressure increases due to an abnormal cause, the temperature automatically follows. That's why a system that reports accurate pressures is way more important that monitoring temperatures and temp alarms.

The system I depend on does have a HIGH temp alarm, but it's for the sensor and is permanently set at 248F to warn the driver about a possible sensor failure. It also has a 25% HIGH pressure alarm.

I am betting that if it was me walking around the coach measuring the tire & wheel temps with my IR gun, I would have noticed the BRAKE DUST immediately on the outside of the wheel & tire. That would have been my FIRST clue, not an after thought.

Dr4Film ----- Richard

Quote:

Originally Posted by 336muffin

Lincolnboy, were you traveling in a direction where your right front tire was in the sun? My front tire when exposed to the sun is always a little warmer than the other side. Is your weight a little heavier on that side? Were you parked in a way with your RF in the sun before you left? It doesn't take much solar to heat a black tire.

It was in the morning, I was traveling due east and the RF tire was in the shade. I do notice in the morning when the coach is parked as the sun comes up and hits the tires (moreso when they are not covered) how they heat up, but the pressure doesnt go up over 10% like it did. I think it is a brake issue now that I've had time to go look and compare the two tires on the front.....Thanks though!

With ANY tire/wheel, if the pressure increases due to an abnormal cause, the temperature automatically follows. That's why a system that reports accurate pressures is way more important that monitoring temperatures and temp alarms.

The system I depend on does have a HIGH temp alarm, but it's for the sensor and is permanently set at 248F to warn the driver about a possible sensor failure. It also has a 25% HIGH pressure alarm.

Dr4Film ----- Richard[/QUOTE]

So Richard, it appears you have a particular distaste for any tpms that is not yours? Or is it just the name brands? (just kidding) This system alerted me to something I did not know about, which is what it is suppose to do. I am EXTREMELY PLEASED with it.

I am betting that if it was me walking around the coach measuring the tire & wheel temps with my IR gun, I would have noticed the BRAKE DUST immediately on the outside of the wheel & tire. That would have been my FIRST clue, not an after thought.

I am also betting YOU would have noticed it too! But, I am not you, and do not have the extensive experience you demonstrate in your responses.

I have only myself and the very limited 3 months of ownership experience to count on, that's why I post and ask questions on this forum. The BRAKE DUST was NOT obvious to me until I began looking closer at the tire/wheel that was generating these high temps and pressures. When I looked at it and then the opposite tire, that's when, to me, it became a probability of it being a brake issue. MIND YOU, I don't have confirmation of my suspicion yet, so I may be totally wrong. As all people are at some point in time. Hindsight is ALWAYS 20/20.

I am betting that if it was me walking around the coach measuring the tire & wheel temps with my IR gun, I would have noticed the BRAKE DUST immediately on the outside of the wheel & tire. That would have been my FIRST clue, not an after thought.

I am also betting YOU would have noticed it too! But, I am not you, and do not have the extensive experience you demonstrate in your responses.

I have only myself and the very limited 3 months of ownership experience to count on, that's why I post and ask questions on this forum. The BRAKE DUST was NOT obvious to me until I began looking closer at the tire/wheel that was generating these high temps and pressures. When I looked at it and then the opposite tire, that's when, to me, it became a probability of it being a brake issue. MIND YOU, I don't have confirmation of my suspicion yet, so I may be totally wrong. As all people are at some point in time. Hindsight is ALWAYS 20/20.

Thanks for the information Richard, it is appreciated!

Kent

Dr4Film ----- Richard

[/QUOTE]

Since this post, I have driven many miles. I have realized my brakes and calipers are ok, and that you all obviously knew more than I did about the pressure and temperatures. It was nothing to be concerned about after all. I thank all of you for the input!